This is a server side issue. There is no explanation from Google what exactly went wrong, but for practical purposes it means your Android ID went sour and you need create a new one (simply delete credentials.cfg from your archive and restart Raccoon to reinitialize it).
No. However, if you want to prevent apps from being updated automatically, you can simply transfer them to a designated "storage" archive.
No. However, if you want to prevent apps from being updated automatically, you can simply transfer them to a designated "storage" archive.
No, Raccoon is only able to download apps.
There are no plans to add movie download capabilities as your usage agreement for Google Movies states that you may only rent digital content, not buy it. Enforcing such restrictions is impossible and undesirable as well.